httpmethod.java

Light in the box 抓取程序。 使用HttpClient

/*
 * $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//httpclient/src/java/org/apache/commons/httpclient/HttpMethod.java,v 1.43 2004/10/07 16:14:15 olegk Exp $
 * $Revision: 480424 $
 * $Date: 2006-11-29 06:56:49 +0100 (Wed, 29 Nov 2006) $
 *
 * ====================================================================
 *
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */

package org.apache.commons.httpclient;

import java.io.IOException;
import java.io.InputStream;

import org.apache.commons.httpclient.auth.AuthState;
import org.apache.commons.httpclient.params.HttpMethodParams;

/**
 * <p>
 * HttpMethod interface represents a request to be sent via a 
 * {@link HttpConnection HTTP connection} and a corresponding response.
 * </p>
 * @author <a href="mailto:[e-mail]">Remy Maucherat</a>
 * @author Rod Waldhoff
 * @author <a href="[e-mail]">Jeff Dever</a>
 * @author <a href="mailto:[e-mail]">Mike Bowler</a>
 * @author <a href="mailto:[e-mail]">Oleg Kalnichevski</a>
 *
 * @version $Revision: 480424 $ $Date: 2006-11-29 06:56:49 +0100 (Wed, 29 Nov 2006) $
 * 
 * @since 1.0
 */
public interface HttpMethod {

    // ------------------------------------------- Property Setters and Getters

    /**
     * Obtains the name of the HTTP method as used in the HTTP request line,
     * for example <tt>"GET"</tt> or <tt>"POST"</tt>.
     * 
     * @return the name of this method
     */
    String getName();

    /**
     * Gets the host configuration for this method.  The configuration specifies
     * the server, port, protocol, and proxy server via which this method will
     * send its HTTP request.
     * 
     * @deprecated no longer applicable 
     * 
     * @return the HostConfiguration or <code>null</code> if none is set
     */
    HostConfiguration getHostConfiguration();

    /**
     * Sets the path of the HTTP method.
     * It is responsibility of the caller to ensure that the path is
     * properly encoded (URL safe).
     * 
     * @param path The path of the HTTP method. The path is expected
     *             to be URL encoded.
     */
    void setPath(String path);

    /**
     * Returns the path of the HTTP method.  
     *
     * Calling this method <em>after</em> the request has been executed will 
     * return the <em>actual</em> path, following any redirects automatically
     * handled by this HTTP method.
     * 
     * @return the path of the HTTP method, in URL encoded form
     */
    String getPath();

    /**
     * Returns the URI for this method. The URI will be absolute if the host
     * configuration has been set and relative otherwise.
     * 
     * @return the URI for this method
     * 
     * @throws URIException if a URI cannot be constructed
     */
    URI getURI() throws URIException;

    /**
     * Sets the URI for this method. 
     * 
     * @param uri URI to be set 
     * 
     * @throws URIException if a URI cannot be set
     * 
     * @since 3.0
     */
    void setURI(URI uri) throws URIException;

    /**
     * Defines how strictly the method follows the HTTP protocol specification.  
     * (See RFC 2616 and other relevant RFCs.) In the strict mode the method precisely
     * implements the requirements of the specification, whereas in non-strict mode 
     * it attempts to mimic the exact behaviour of commonly used HTTP agents, 
     * which many HTTP servers expect.
     * 
     * @param strictMode <tt>true</tt> for strict mode, <tt>false</tt> otherwise
     * 
     * @deprecated Use {@link org.apache.commons.httpclient.params.HttpParams#setParameter(String, Object)} 
     * to exercise a more granular control over HTTP protocol strictness.
     * 
     * @see #isStrictMode()
     */
    void setStrictMode(boolean strictMode);

    /**
     * Returns the value of the strict mode flag.
     *
     * @return <tt>true</tt> if strict mode is enabled, <tt>false</tt> otherwise
     * 
     * @deprecated Use {@link org.apache.commons.httpclient.params.HttpParams#setParameter(String, Object)} 
     * to exercise a more granular control over HTTP protocol strictness.
     * 
     * @see #setStrictMode(boolean)
     */
    boolean isStrictMode();
     
    /**
     * Sets the specified request header, overwriting any
     * previous value.
     * Note that header-name matching is case insensitive.
     * @param headerName the header's name
     * @param headerValue the header's value
     *
     * @see #setRequestHeader(Header)
     * @see #getRequestHeader(String)
     * @see #removeRequestHeader(String)
     */
    void setRequestHeader(String headerName, String headerValue);

    /**
     * Sets the specified request header, overwriting any
     * previous value.
     * Note that header-name matching is case insensitive.
     * @param header the header to be set
     *
     * @see #setRequestHeader(String,String)
     * @see #getRequestHeader(String)
     * @see #removeRequestHeader(String)
     */
    void setRequestHeader(Header header);

    /**
     * Adds the specified request header, <em>not</em> overwriting any previous value.
     * If the same header is added multiple times, perhaps with different values,
     * multiple instances of that header will be sent in the HTTP request.
     * Note that header-name matching is case insensitive.
     * @param headerName the header's name
     * @param headerValue the header's value
     * 
     * @see #addRequestHeader(Header)
     * @see #getRequestHeader(String)
     * @see #removeRequestHeader(String)
     */
    void addRequestHeader(String headerName, String headerValue);

    /**
     * Adds the specified request header, <em>not</em> overwriting any previous value.
     * If the same header is added multiple times, perhaps with different values,
     * multiple instances of that header will be sent in the HTTP request.
     * Note that header-name matching is case insensitive.
     * @param header the header
     * 
     * @see #addRequestHeader(String,String)
     * @see #getRequestHeader(String)
     * @see #removeRequestHeader(String)
     */
    void addRequestHeader(Header header);

    /**
     * Gets the request header with the given name.
     * If there are multiple headers with the same name,
     * there values will be combined with the ',' separator as specified by RFC2616.
     * Note that header-name matching is case insensitive.
     * @param headerName the header name
     * @return the header
     */
    Header getRequestHeader(String headerName);

    /**
     * Removes all request headers with the given name.
     * Note that header-name matching is case insensitive.
     * @param headerName the header name
     */
    void removeRequestHeader(String headerName);

    /**
     * Removes the given request header.
     * 
     * @param header the header
     * 
     * @since 3.0
     */
    void removeRequestHeader(Header header);

    /**
     * Returns <tt>true</tt> if the HTTP method should automatically follow HTTP redirects 
     * (status code 302, etc.), <tt>false</tt> otherwise.
     * 
     * @return <tt>true</tt> if the method will automatically follow HTTP redirects, 
     * <tt>false</tt> otherwise
     */
    boolean getFollowRedirects();

    /**
     * Sets whether or not the HTTP method should automatically follow HTTP redirects 
     * (status code 302, etc.)
     * 
     * @param followRedirects <tt>true</tt> if the method will automatically follow redirects,
     * <tt>false</tt> otherwise.
     */
    void setFollowRedirects(boolean followRedirects);

    /**
     * Sets the query string of the HTTP method.
     * It is responsibility of the caller to ensure that the path is
     * properly encoded (URL safe).  The string must not include an initial '?' character.
     * 
     * @param queryString the query to be used in the request, with no leading '?' character
     * 
     * @see #getQueryString()
     * @see #setQueryString(NameValuePair[])
     */
    void setQueryString(String queryString);

    /**
     * Sets the query string of this HTTP method.  The pairs are encoded as UTF-8 characters.  
     * To use a different charset the parameters can be encoded manually using EncodingUtil 
     * and set as a single String.
     *
     * @param params An array of <code>NameValuePair</code>s to use as the query string.
     *               The name/value pairs will be automatically URL encoded and should not
     *               have been encoded previously.
     * 
     * @see #getQueryString()
     * @see #setQueryString(String)
     * @see org.apache.commons.httpclient.util.EncodingUtil#formUrlEncode(NameValuePair[], String)
     */
    void setQueryString(NameValuePair[] params);

    /**
     * Returns the query string of this HTTP method.
     * 
     * @return the query string in URL encoded form, without a leading '?'.
     * 
     * @see #setQueryString(NameValuePair[]) 
     * @see #setQueryString(String)
     */
    String getQueryString();

    /**
     * Returns the current request headers for this HTTP method.  The returned headers
     * will be in the same order that they were added with <code>addRequestHeader</code>.
     * If there are multiple request headers with the same name (e.g. <code>Cookie</code>),
     * they will be returned as multiple entries in the array.
     * 
     * @return an array containing all of the request headers
     * 
     * @see #addRequestHeader(Header)
     * @see #addRequestHeader(String,String)